If you have "free electricity" costs then I'd suggest to get a either of the following:

https://www.bitmaintech.com/productDetail.htm?pid=000201412231604153619o9X1obn0693

or probably the best deal on the market at the moment:

http://www.spondoolies-tech.com/products/roadstresss-sp20-special-holiday-gb


Either of those options should fulfill your mining needs.  As for PSU's, multiples of these would do the ticket:

Seasonic SS-650KM and Corsair CX750M


Before you dive right into mining, make sure you know the exact terms of electrical use for your lease/rental contract/mom or pop.  Whoever pays the bill will be sure to come knocking at your door at some point.  Running these things 24/7 will sure make the electrical bill pop!